Allow configuring Mintlify Web UI branch naming

[jfconde-payrails]

When creating new giit branches, in order to make documentation changes, through the Mintlify web UI, these are prefixed with the author's name (like dave/branch-name). This makes it impossible to align with branch naming patterns established across an organization (for example, using issue/ticket ids as prefixes).

The requested feature is the ability to configure, for a Mintlify project/site, the naming scheme for branches or, at a minimum, be able to disable the prefix (as users can enter their desired branch name in the branch dropdown input).